Remington acquired Marlin Firearms in 2007. Anything after that is Remington manufactured. You can tell buy looking at the proof mark on the barrel. A Marlin manufactured rifle will have a JM stamped in the left side of the barrel near the receiver. A Remington manufactured rifle will have an REP proof mark in the right side of the barrel. A gun with out this proof mark was most likely re-barreled as the proof mark was only applied at the factory after the complete rifle was test fired.